Definition of rudder in English:


Syllabification: rud·der
Pronunciation: /ˈrədər


  • 1A flat piece, usually of wood, metal, or plastic, hinged vertically near the stern of a boat or ship for steering.
    More example sentences
    • The ship has rudders and bowthrusters for harbour manoeuvring.
    • The sailboat has a fin keel and a rudder that resemble the dorsal and pectoral fins of orcas.
    • These were clinker-built - that is, with timbers overlapping and not laid flush - with flat bottom, straight stem and stern posts, a stern rudder and a single sail.
  • 1.1A vertical airfoil pivoted from the horizontal stabilizer of an aircraft, for controlling movement around the vertical axis.
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    • Instead of a traditional rudder for yaw control, the upper and lower surfaces are each fitted with two sections of moving surfaces.
    • Agglomerations of wings and cowling, flaps, rudders and fuselage rise dramatically from narrow steel legs.
    • The Hunter air vehicle is a fixed wing, twin tail boom aircraft with a dual rudder.
  • 1.2Application of a rudder in steering a boat, ship, or aircraft: bring the aircraft to a stall and apply full rudder a small amount of extra rudder
    More example sentences
    • It is highly spin-resistant, requiring full rudder to initiate and maintain a spin and recovering in one turn after centralising the flying controls.
    • This was the only airspeed that provided a predictable and constant level of yaw that I could counter with full rudder.
    • Now I did have a blown tire, and as the aircraft slowed through 100 knots, the pull to the right required almost a full boot of left rudder to keep the aircraft on the runway.


Old English rōther 'paddle, oar'; related to Dutch roer, German Ruder, also to the verb row2.

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